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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019947d6ac9e63768b186de940cc40c9b1619449b15c03b8e6a992b247c63bf1' 
  AND token = 'f/YwWDe7lSkQQ3P3N7wx7vrB3w/rOvTpX2fVtoZJcdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}